Re: [PATCH 03/21] arm64: KVM: Implement vgic-v2 save/restore

2015-11-20 Thread Steve Capper 
On Mon, Nov 16, 2015 at 01:11:41PM +, Marc Zyngier wrote:
> Implement the vgic-v2 save restore as a direct translation of
> the assembly code version.

Hi Marc,
I have one comment below:

Cheers,
-- 
Steve


> 
> Signed-off-by: Marc Zyngier 
> ---
>  arch/arm64/kvm/Makefile |  1 +
>  arch/arm64/kvm/hyp/Makefile |  5 +++
>  arch/arm64/kvm/hyp/hyp.h|  3 ++
>  arch/arm64/kvm/hyp/vgic-v2-sr.c | 85 
> +
>  4 files changed, 94 insertions(+)
>  create mode 100644 arch/arm64/kvm/hyp/Makefile
>  create mode 100644 arch/arm64/kvm/hyp/vgic-v2-sr.c
> 
> diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
> index 1949fe5..d31e4e5 100644
> --- a/arch/arm64/kvm/Makefile
> +++ b/arch/arm64/kvm/Makefile
> @@ -10,6 +10,7 @@ KVM=../../../virt/kvm
>  ARM=../../../arch/arm/kvm
>  
>  obj-$(CONFIG_KVM_ARM_HOST) += kvm.o
> +obj-$(CONFIG_KVM_ARM_HOST) += hyp/
>  
>  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o 
> $(KVM)/eventfd.o $(KVM)/vfio.o
>  kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o
> diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
> new file mode 100644
> index 000..d8d5968
> --- /dev/null
> +++ b/arch/arm64/kvm/hyp/Makefile
> @@ -0,0 +1,5 @@
> +#
> +# Makefile for Kernel-based Virtual Machine module, HYP part
> +#
> +
> +obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o
> diff --git a/arch/arm64/kvm/hyp/hyp.h b/arch/arm64/kvm/hyp/hyp.h
> index dac843e..78f25c4 100644
> --- a/arch/arm64/kvm/hyp/hyp.h
> +++ b/arch/arm64/kvm/hyp/hyp.h
> @@ -27,5 +27,8 @@
>  
>  #define kern_hyp_va(v) (typeof(v))((unsigned long)v & HYP_PAGE_OFFSET_MASK)
>  
> +void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
> +void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
> +
>  #endif /* __ARM64_KVM_HYP_H__ */
>  
> diff --git a/arch/arm64/kvm/hyp/vgic-v2-sr.c b/arch/arm64/kvm/hyp/vgic-v2-sr.c
> new file mode 100644
> index 000..1382d2e
> --- /dev/null
> +++ b/arch/arm64/kvm/hyp/vgic-v2-sr.c
> @@ -0,0 +1,85 @@
> +/*
> + * Copyright (C) 2012-2015 - ARM Ltd
> + * Author: Marc Zyngier 
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see .
> + */
> +
> +#include 
> +#include 
> +#include 
> +
> +#include 
> +
> +#include "hyp.h"
> +
> +/* vcpu is already in the HYP VA space */
> +void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
> +{
> + struct kvm *kvm = kern_hyp_va(vcpu->kvm);
> + struct vgic_v2_cpu_if *cpu_if = >arch.vgic_cpu.vgic_v2;
> + struct vgic_dist *vgic = >arch.vgic;
> + void __iomem *base = kern_hyp_va(vgic->vctrl_base);
> + u32 __iomem *lr_base;
> + u32 eisr0, eisr1, elrsr0, elrsr1;
> + int i = 0, nr_lr;
> +
> + if (!base)
> + return;
> +
> + cpu_if->vgic_vmcr = readl_relaxed(base + GICH_VMCR);
> + cpu_if->vgic_misr = readl_relaxed(base + GICH_MISR);
> + eisr0  = readl_relaxed(base + GICH_EISR0);
> + eisr1  = readl_relaxed(base + GICH_EISR0);

Not sure what this would affect, but should the RHS be:
"base + GICH_EISR1"?

> + elrsr0 = readl_relaxed(base + GICH_ELRSR0);
> + elrsr1 = readl_relaxed(base + GICH_ELRSR1);
> +#ifdef CONFIG_CPU_BIG_ENDIAN
> + cpu_if->vgic_eisr  = ((u64)eisr0 << 32) | eisr1;
> + cpu_if->vgic_elrsr = ((u64)elrsr0 << 32) | elrsr1;
> +#else
> + cpu_if->vgic_eisr  = ((u64)eisr1 << 32) | eisr0;
> + cpu_if->vgic_elrsr = ((u64)elrsr1 << 32) | elrsr0;
> +#endif
> + cpu_if->vgic_apr= readl_relaxed(base + GICH_APR);
> +
> + writel_relaxed(0, base + GICH_HCR);
> +
> + lr_base = base + GICH_LR0;
> + nr_lr = vcpu->arch.vgic_cpu.nr_lr;
> + do {
> + cpu_if->vgic_lr[i++] = readl_relaxed(lr_base++);
> + } while (--nr_lr);
> +}
> +
> +void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu)
> +{
> + struct kvm *kvm = kern_hyp_va(vcpu->kvm);
> + struct vgic_v2_cpu_if *cpu_if = >arch.vgic_cpu.vgic_v2;
> + struct vgic_dist *vgic = >arch.vgic;
> + void __iomem *base = kern_hyp_va(vgic->vctrl_base);
> + u32 __iomem *lr_base;
> + unsigned int i = 0, nr_lr;
> +
> + if (!base)
> + return;
> +
> + writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);
> + writel_relaxed(cpu_if->vgic_vmcr, base + GICH_VMCR);
> + writel_relaxed(cpu_if->vgic_apr, base + GICH_APR);
> +
> + lr_base = base + GICH_LR0;
> +

Re: [PATCH 03/21] arm64: KVM: Implement vgic-v2 save/restore

2015-11-20 Thread Marc Zyngier 
Hi Steve,

On 20/11/15 15:22, Steve Capper wrote:
> On Mon, Nov 16, 2015 at 01:11:41PM +, Marc Zyngier wrote:
>> > Implement the vgic-v2 save restore as a direct translation of
>> > the assembly code version.
> Hi Marc,
> I have one comment below:
> 
> Cheers,
> -- Steve
>> > 
>> > Signed-off-by: Marc Zyngier 
>> > ---
>> >  arch/arm64/kvm/Makefile |  1 +
>> >  arch/arm64/kvm/hyp/Makefile |  5 +++
>> >  arch/arm64/kvm/hyp/hyp.h|  3 ++
>> >  arch/arm64/kvm/hyp/vgic-v2-sr.c | 85 
>> > +
>> >  4 files changed, 94 insertions(+)
>> >  create mode 100644 arch/arm64/kvm/hyp/Makefile
>> >  create mode 100644 arch/arm64/kvm/hyp/vgic-v2-sr.c
>> > 
>> > diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
>> > index 1949fe5..d31e4e5 100644
>> > --- a/arch/arm64/kvm/Makefile
>> > +++ b/arch/arm64/kvm/Makefile
>> > @@ -10,6 +10,7 @@ KVM=../../../virt/kvm
>> >  ARM=../../../arch/arm/kvm
>> >  
>> >  obj-$(CONFIG_KVM_ARM_HOST) += kvm.o
>> > +obj-$(CONFIG_KVM_ARM_HOST) += hyp/
>> >  
>> >  kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o 
>> > $(KVM)/eventfd.o $(KVM)/vfio.o
>> >  kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o
>> > diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
>> > new file mode 100644
>> > index 000..d8d5968
>> > --- /dev/null
>> > +++ b/arch/arm64/kvm/hyp/Makefile
>> > @@ -0,0 +1,5 @@
>> > +#
>> > +# Makefile for Kernel-based Virtual Machine module, HYP part
>> > +#
>> > +
>> > +obj-$(CONFIG_KVM_ARM_HOST) += vgic-v2-sr.o
>> > diff --git a/arch/arm64/kvm/hyp/hyp.h b/arch/arm64/kvm/hyp/hyp.h
>> > index dac843e..78f25c4 100644
>> > --- a/arch/arm64/kvm/hyp/hyp.h
>> > +++ b/arch/arm64/kvm/hyp/hyp.h
>> > @@ -27,5 +27,8 @@
>> >  
>> >  #define kern_hyp_va(v) (typeof(v))((unsigned long)v & 
>> > HYP_PAGE_OFFSET_MASK)
>> >  
>> > +void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
>> > +void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
>> > +
>> >  #endif /* __ARM64_KVM_HYP_H__ */
>> >  
>> > diff --git a/arch/arm64/kvm/hyp/vgic-v2-sr.c 
>> > b/arch/arm64/kvm/hyp/vgic-v2-sr.c
>> > new file mode 100644
>> > index 000..1382d2e
>> > --- /dev/null
>> > +++ b/arch/arm64/kvm/hyp/vgic-v2-sr.c
>> > @@ -0,0 +1,85 @@
>> > +/*
>> > + * Copyright (C) 2012-2015 - ARM Ltd
>> > + * Author: Marc Zyngier 
>> > + *
>> > + * This program is free software; you can redistribute it and/or modify
>> > + * it under the terms of the GNU General Public License version 2 as
>> > + * published by the Free Software Foundation.
>> > + *
>> > + * This program is distributed in the hope that it will be useful,
>> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> > + * GNU General Public License for more details.
>> > + *
>> > + * You should have received a copy of the GNU General Public License
>> > + * along with this program.  If not, see .
>> > + */
>> > +
>> > +#include 
>> > +#include 
>> > +#include 
>> > +
>> > +#include 
>> > +
>> > +#include "hyp.h"
>> > +
>> > +/* vcpu is already in the HYP VA space */
>> > +void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
>> > +{
>> > +  struct kvm *kvm = kern_hyp_va(vcpu->kvm);
>> > +  struct vgic_v2_cpu_if *cpu_if = >arch.vgic_cpu.vgic_v2;
>> > +  struct vgic_dist *vgic = >arch.vgic;
>> > +  void __iomem *base = kern_hyp_va(vgic->vctrl_base);
>> > +  u32 __iomem *lr_base;
>> > +  u32 eisr0, eisr1, elrsr0, elrsr1;
>> > +  int i = 0, nr_lr;
>> > +
>> > +  if (!base)
>> > +  return;
>> > +
>> > +  cpu_if->vgic_vmcr = readl_relaxed(base + GICH_VMCR);
>> > +  cpu_if->vgic_misr = readl_relaxed(base + GICH_MISR);
>> > +  eisr0  = readl_relaxed(base + GICH_EISR0);
>> > +  eisr1  = readl_relaxed(base + GICH_EISR0);
> Not sure what this would affect, but should the RHS be:
> "base + GICH_EISR1"?

-ECOPYPASTE. We're just lucky that we only have 4 list registers, and
thus never look past the first word.

Thanks a lot for noticing this!

M.
-- 
Jazz is not dead. It just smells funny...
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